1380 THE BUTTERFLIES OF NEW ENGLAND. 



femora of equal length, middle femora half as long again. Fore tibiae two-thirds the 

 length of fore femora and a little more than half as long as the middle and hind tibiae ; 

 these are equal, the middle pair nearly as long as its femora, the hind tibiae one-third 

 longer than the hind femora. Leaf -like appendage of fore tibiae long and very slender, 

 originating scarcely beyond the middle of the joint, surpassing its extremity a little, 

 more than four times as long as broad, a very little arcuate, especially in its apical 

 half, bluntly pointed at the tip. Middle tibiae with a pair of stout, apical spurs, hind 

 tibiae with a similar apical pair and a second just beyond the middle of the joint; 

 tarsi 1, 2, 3, 4, 5 ; fore tarsi rather more than two-thirds as long as the middle, rather 

 less than two-thirds as long as the hind tarsi ; hind tarsi one-fourth longer than middle 

 tarsi ; all the tarsi with a triple row of slender spines beneath, the apical ones of the 

 outer rows of each joint a little longer than the others ; basal joint as long as the 

 second, third and fourth together on the hind legs, as long as all the rest together on 

 the other legs ; second joint about two-fifths as long as the first. Claws small, the 

 apical half bent considerably, the basal half tapering, finely pointed. Pad large, 

 buUate, apically transverse and appressed, from tlie middle of the sides of which pro- 

 ject minute, conical, pointed paronychia resembling the apical third of the claws. 



Male abdominal appendages having the centrum of the upper organ a little com- 

 pressed but tumid, well arched and prominent posteriorly. Hooks as long as the cen- 

 trum, independent, parallel, nearly horizontal and straight, slender, compressed and not 

 pointed; lateral arms forming a simple sheath extending nearly to the tip of the hooks. 

 Clasps large, nearly equal, twice as long as broad, but little convex, posterior edge 

 angulated near the middle ; upper posterior angle slightly prominent and denticulate. 



Egg. Broader than high, broadest near the base, the sides nearly equal, above 

 strongly arched and at summit truncate, with a distinct shoulder at the base of the 

 dome, furnished with a rather scanty number of vertical ribs, hardly so high as broad, 

 broadest on the domed portion, fading below on the sides to nothing at the base, all of 

 them extending to the micropylic basin which is of unusual size, saucer-shaped ; the 

 ribs have a denticulate or granulate appearance where highest from the alternation of 

 course, due to the Impinging of the cross lines which run at very brief intervals in a 

 straight course traversing the interspaces, at least in the upper half of the egg; the 

 interspaces are scarcely waved but almost perfectly flat. Described from specimens 

 in glycerine. 



Caterpillar at birth. Head large, well rounded, scarcely bilobed, broadest below, 

 narrowest above, of about equal height and breadth ; the front well rounded on a side 

 view; triangle half as high as the head, somewhat higher than broad; furnished with 

 a few definitely arranged, short, curving and tapering bristles; mouth parts enclosed 

 in a transverse, broad oval, hardly more than a third as broad as the head ; ocelli five 

 in number, equal ; four equidistant in a regular, arcuate row, its convexity forward; 

 the fifth posterior, on a level with the third from the top and forming with it and the 

 uppermost a nearly equilateral triangle. First segment of the body with a broad, 

 equal, dorsal shield, conspicuous, not nearly reaching the spiracles on either side; the 

 body equal, furnished with many straight, rather stout bristles about half as long as 

 the segments, scarcely expanding apically but cup-shaped with a sharp rim ; they are 

 apparently disposed in longitudinal rows very much as in Epargyreus, the mode in 

 which my specimens are mounted not permitting a more exact statement. First pair 

 of legs horny, the other more fleshy ; both with similar, strongly heeled, mesially 

 bent, compressed, minute claws; prolegs short, stout, stumpy, the booklets somewhat 

 similar to the claws of the other legs but not more than a quarter as large, without a 

 heel ; they are arranged in an oval to the number of about twenty on the ventral pro- 

 legs. Described from specimens mounted in glycerine. 



Mature caterpillar. Head subglobular, the sides strongly arcuate, almost bent in 

 the middle where it is broadest ; the summit nearly flat and half as wide only as the 

 middle of the head ; very broadly arcuate beneath, the inner frontal triangle nearly 

 twice as high as broad, reaching just above the centre of the head ; the head of equal 

 height and breadth, fully twice as high as deep, deepest in the middle, scarcely less 



